High severity · published Oct 20, 2026
CVE-2026-92843
Out-of-bounds Read via the TLS 1.3 Certificate extensions_length in NetX Secure
8.7
CVSS
0.3%
EPSS
No
On KEV
Description
A missing bounds check in the TLS 1.3 Certificate-message parser of NetX Secure lets a malicious TLS 1.3 server trigger an unsigned-integer underflow and a subsequent heap out-of-bounds read in any peer that processes a remote Certificate message. It is reachable pre-authentication, during the normal handshake, before certificate verification completes.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 22% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ET
Eclipse ThreadX - NetX Duo · Eclipse Foundation
through 6.5.1.202602 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-92843
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-92843
github.com
https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-4m85-f9qh-q3jv
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